From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Philip Yang <Philip.Yang@amd.com>,
Ralph Campbell <rcampbell@nvidia.com>,
John Hubbard <jhubbard@nvidia.com>,
Felix.Kuehling@amd.com, dri-devel@lists.freedesktop.org,
linux-mm@kvack.org, Jerome Glisse <jglisse@redhat.com>,
Jason Gunthorpe <jgg@mellanox.com>,
amd-gfx@lists.freedesktop.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2 hmm 4/9] mm/hmm: remove HMM_FAULT_SNAPSHOT
Date: Tue, 24 Mar 2020 08:33:39 +0100 [thread overview]
Message-ID: <20200324073339.GC23447@lst.de> (raw)
In-Reply-To: <20200324011457.2817-5-jgg@ziepe.ca>
>
> +/*
> + * If the valid flag is masked off, and default_flags doesn't set valid, then
> + * hmm_pte_need_fault() always returns 0.
> + */
> +static bool hmm_can_fault(struct hmm_range *range)
> +{
> + return ((range->flags[HMM_PFN_VALID] & range->pfn_flags_mask) |
> + range->default_flags) &
> + range->flags[HMM_PFN_VALID];
> +}
So my idea behind the helper was to turn this into something readable :)
E.g.
/*
* We only need to fault if either the default mask requires to fault all
* pages, or at least the mask allows for individual pages to be faulted.
*/
static bool hmm_can_fault(struct hmm_range *range)
{
return ((range->default_flags | range->pfn_flags_mask) &
range->flags[HMM_PFN_VALID]);
}
In fact now that I managed to destill it down to this I'm not even
sure we really even need the helper, although the comment really helps.
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next prev parent reply other threads:[~2020-03-24 8:14 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 1:14 [PATCH v2 hmm 0/9] Small hmm_range_fault() cleanups Jason Gunthorpe
2020-03-24 1:14 ` [PATCH v2 hmm 1/9] mm/hmm: remove pgmap checking for devmap pages Jason Gunthorpe
2020-03-24 1:14 ` [PATCH v2 hmm 2/9] mm/hmm: return the fault type from hmm_pte_need_fault() Jason Gunthorpe
2020-03-24 7:27 ` Christoph Hellwig
2020-03-24 18:58 ` Jason Gunthorpe
2020-03-24 1:14 ` [PATCH v2 hmm 3/9] mm/hmm: remove unused code and tidy comments Jason Gunthorpe
2020-03-24 7:27 ` Christoph Hellwig
2020-03-24 1:14 ` [PATCH v2 hmm 4/9] mm/hmm: remove HMM_FAULT_SNAPSHOT Jason Gunthorpe
2020-03-24 7:33 ` Christoph Hellwig [this message]
2020-03-24 19:31 ` Jason Gunthorpe
2020-03-24 1:14 ` [PATCH v2 hmm 5/9] mm/hmm: remove the CONFIG_TRANSPARENT_HUGEPAGE #ifdef Jason Gunthorpe
2020-03-24 7:33 ` Christoph Hellwig
2020-03-24 1:14 ` [PATCH v2 hmm 6/9] mm/hmm: use device_private_entry_to_pfn() Jason Gunthorpe
2020-03-24 7:34 ` Christoph Hellwig
2020-03-24 1:14 ` [PATCH v2 hmm 7/9] mm/hmm: do not unconditionally set pfns when returning EBUSY Jason Gunthorpe
2020-03-24 7:37 ` Christoph Hellwig
2020-03-24 15:47 ` Jason Gunthorpe
2020-03-24 1:14 ` [PATCH v2 hmm 8/9] mm/hmm: do not set pfns when returning an error code Jason Gunthorpe
2020-03-24 7:38 ` Christoph Hellwig
2020-03-24 1:14 ` [PATCH v2 hmm 9/9] mm/hmm: return error for non-vma snapshots Jason Gunthorpe
2020-03-24 7:45 ` Christoph Hellwig
2020-03-26 21:21 ` [PATCH v2 hmm 0/9] Small hmm_range_fault() cleanups Ralph Campbell
2020-03-27 20:00 [PATCH v3 " Jason Gunthorpe
2020-03-27 20:00 ` [PATCH v2 hmm 4/9] mm/hmm: remove HMM_FAULT_SNAPSHOT Jason Gunthorpe
2020-03-28 8:11 ` Christoph Hellwig
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